Retirement Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Rate of employee contribution from earnings	80.00%
Matching contribution allocation rate first time	100.00%
Employee contribution rate for first time matching	3.00%
Matching contribution allocation rate second time	50.00%
Employees contribution rate for second time matching	3.00%
Employer contribution in common stock	$ 35	$ 33	$ 32
Minimum range of eligible compensation for noncontributory profit sharing feature	0.00%
Maximum range of eligible compensation for noncontributory profit sharing feature	3.50%
Accrued profit sharing expense	$ 16	19	$ 24
Supplemental Employee Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Benefit liability	9	10
Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Benefit liability	$ 1	$ 1